Blackberry Jam
Ingredients
Directions
Make the jam
Boil the blackberries and sugar together for 40 minutes.
Store
Cover closely and store in a dry, cool place.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
What each ingredient does
- Blackberries
- Provide the fruit base, along with natural pectin and flavour for the jam.
- Sugar
- Sweetens the jam and helps it set by binding water and thickening the fruit as it cooks.
The step that matters
Boiling the blackberries and sugar for 40 minutes. Boiling long enough drives off water so the sugar and fruit pectin can set. Too little boiling leaves a runny jam that may spoil sooner, while overcooking can darken the flavour and make it stiff.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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